Record details

    Shell morphology and palaeoecology of Praenatica gregaria Perner, 1903 from the Koněprusy Limestone (Lower Devonian) of Bohemia (Czech Republic)
Statement of responsibility
    Martin Jankovský
    Jankovský, Martin
Source title - serial
    Bulletin of geosciences
    Vol. 78, no. 4
    p. 423-429
    1 obr., 2 diagr., 6 fot., 31 bibl.
    Zkr. název ser.: Bull. Geosci.
Subject group
    distribuce četnosti
    pražská pánev
    prostředí energeticky silné
    prostředí útesové
Geographical name
    Měňany (Beroun)
Abstract (in english)
   Praenatica gregaria Perner, 1903 is an Early Devonian (Pragian) gastropod that is judged to be adapted to a stationary living habit on the tegmen of camerate crinoids. More than one thousand specimens were examined in order to describe and explain the occurrence of different morphological forms. The variability of the shells was found to be closely dependent on the attachment surface. Rapid growth changes during an ontogeny demonstrate the ability to move, perhaps even change hosts. Traces of colour patterns, epizoans in situ and repaired shell fractures were observed in some cases. The reconstructed colour pattern consists of longitudinal bands often transversally crossed by growth lines lacking pigment and probably serving a sheltering function. Various epizoans showed that the empty conch served as an appropriate base for the attachment of small and fragile organisms, most commonly bryozoan colonies. The majority of the studied shell fractures were formed passively in the surf.
   only some of them show evidence of the activity of molluscivorous predators
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    31. 3. 2008
Import date
    8. 8. 2012